Waste gas collecting device for injection molding machine

Abstract

The utility model relates to the technical field of waste gas collecting devices, in particular to a waste gas collecting device for an injection molding machine, which comprises a waste gas collecting mechanism, the waste gas collecting mechanism comprises a first square plate, and a waste gas cooling mechanism is fixedly connected to the outer wall of the first square plate close to the center position. A dust falling mechanism is fixedly connected to the position, located on one side of the waste gas cooling mechanism, of the outer wall of the first square plate, a filtering mechanism is fixedly connected to the top end of the dust falling mechanism, a pipeline fan is fixedly connected to the position, close to one end, of the outer wall of the first square plate, and an exhaust pipe is fixedly connected to an air inlet of the pipeline fan; and an air outlet of the pipeline fan is fixedly connected with an air supply pipe, and the waste gas cooling mechanism comprises a first empty box. According to the utility model, through the driving of the pipeline fan, high-temperature waste gas generated in the working process of the injection molding machine can be quickly extracted from the exhaust pipe and sent to the waste gas cooling mechanism, power is provided for the waste gas needing to be purified, and the conveying efficiency of the waste gas is effectively improved.

Description

Technical Field

[0001] The utility model relates to the technical field of waste gas collecting devices, in particular to a waste gas collecting device for an injection molding machine. Background Art

[0002] The waste gas collection device for injection molding machines is a collection device specially designed for the waste gas generated when the injection molding machine is working, which is used to improve the working environment and reduce environmental pollution. When the existing waste gas collection device for injection molding machines processes high-temperature waste gas, the waste gas is usually sent into a box with a heat exchange tube, and the heat absorption effect is achieved by the contact between the waste gas and the heat exchange tube. However, the existing heat absorption mechanism cannot effectively make the high-temperature waste gas contact evenly with the surface of the heat exchange tube, and can only locally absorb heat from the waste gas, thereby reducing the cooling efficiency. Utility Model Content

[0003] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an exhaust gas collection device for an injection molding machine. Driven by a pipeline fan, the high-temperature exhaust gas generated during the operation of the injection molding machine can be quickly extracted from the exhaust pipe and sent to the exhaust gas cooling mechanism. It also provides power for the exhaust gas that needs to be purified, effectively improving the exhaust gas transportation efficiency. By providing baffle one, baffle two or square plate two, the gathered high-temperature exhaust gas can be dispersed and blown out along several circular holes, so that the exhaust gas is evenly dispersed, effectively improving the working stability and gas diffusivity.

[0004] The purpose of this utility model can be achieved through the following technical solutions:

[0005] An exhaust gas collection device for an injection molding machine, comprising an exhaust gas collection mechanism, the exhaust gas collection mechanism comprising a square plate 1, an exhaust gas cooling mechanism is fixedly connected to the outer wall of the square plate 1 near the center, a dust reduction mechanism is fixedly connected to the outer wall of the square plate 1 at one side of the exhaust gas cooling mechanism, and a filtering mechanism is fixedly connected to the top of the dust reduction mechanism;

[0006] A duct fan is fixedly connected to an outer wall of the square plate near one end, an air inlet of the duct fan is fixedly connected to an exhaust duct, and an air outlet of the duct fan is fixedly connected to an air supply duct. The exhaust gas cooling mechanism includes an empty box one, an outer wall of the empty box one is fixedly connected to an outer wall of the square plate one, and one end of the air supply duct is fixedly connected to an outer wall of the empty box one.

[0007] Furthermore, a baffle plate 1 is fixedly connected to a bottom position of one side inside the empty box 1, a baffle plate 2 is fixedly connected to a position of the baffle plate 1 inside the empty box 1, a square plate 2 is fixedly connected to a side of the baffle plate 2 inside the empty box 1, and a plurality of circular holes 1 are opened at equal intervals on an outer wall of the square plate 2.

[0008] Preferably: a hollow plate is fixedly connected to the interior of the empty box 1 near the center position, a plurality of circular holes 2 are opened at equal intervals on the outer wall of the hollow plate, a circular tube 3 is fixedly connected to the outer wall of one side of the hollow plate, and a circular tube 4 is fixedly connected to the outer wall of the other side of the hollow plate.

[0009] Preferably: a circular shell one is rotatably connected to an inner portion of the empty box near one side, a circular tube one is fixedly connected to an outer wall of one side of the empty box at a location of the circular shell, a circular tube two is fixedly connected to an outer wall of the other side of the empty box at a location of the circular shell, a plurality of circular holes four are opened at equal angles on the outer wall of the circular shell one around its axis, and a plurality of circular holes three are opened at equal angles on one side wall of the circular shell around its axis.

[0010] Preferably: the dust reduction mechanism includes an empty box two, the outer wall of the empty box two is fixedly connected to the outer wall of the square plate one, a circular tube five is penetrated and rotatably connected to the outer wall of the empty box two, the outer wall of one end of the circular tube five is fixedly connected to a round rod, the outer wall of one end of the round rod is located inside the empty box one and is fixedly connected to the outer wall of the circular shell one, the outer wall of one end of the circular tube five is sleeved and fixedly connected to a spur gear one, the outer wall of the empty box two is located at the circular tube five and is fixedly connected to a motor, the outer wall of the motor's rotating shaft is sleeved and fixedly connected to a spur gear two, and the spur gear two is meshed with the spur gear one for transmission.

[0011] Preferably: the outer wall of one end of the circular tube five is rotatably connected with a rotating joint, the outer wall of the rotating joint is fixedly connected to the outer wall of the empty box two, the outer wall of the circular tube five is provided with a water outlet hole, and the water outlet hole of the outer wall of the circular tube five is sleeved and fixedly connected with a circular shell two, the outer wall of the circular shell two is fixedly connected with four circular tubes six at equal angles around its axis, and the outer wall of the circular tube six is ​​fixedly connected with a plurality of nozzles at equal intervals.

[0012] Preferably: an air supply pipe is fixedly connected to the outer wall at the top end of empty box two, the filtering mechanism comprises empty box three, the outer wall of empty box three is fixedly connected to the outer wall of empty box two, one end of the air supply pipe is fixedly connected to the bottom end of empty box three, an activated carbon filter plate is fixedly connected to the inside of empty box three, and a circular tube seven is fixedly connected to the outer wall at the top end of empty box three.

[0013] Beneficial effects of this utility:

[0014] 1. An exhaust gas cooling mechanism is fixedly connected to the outer wall of the square plate near the center, a dust reduction mechanism is fixedly connected to the outer wall of the square plate at one side of the exhaust gas cooling mechanism, and a filtering mechanism is fixedly connected to the top of the dust reduction mechanism, and a duct fan is fixedly connected to the outer wall of the square plate near one end, an exhaust duct is fixedly connected to the air inlet of the duct fan, and an air supply duct is fixedly connected to the air outlet of the duct fan. The exhaust gas cooling mechanism mainly includes an empty box, an outer wall of the empty box is fixedly connected to the outer wall of the square plate, and one end of the air supply duct is fixedly connected to the outer wall of the empty box. The high-temperature exhaust gas generated by the injection molding machine during operation can be quickly extracted from the exhaust duct and sent to the exhaust gas cooling mechanism through the drive of the duct fan, and power is provided for the exhaust gas that needs to be purified, thereby effectively improving the exhaust gas transportation efficiency.

[0015] 2. A baffle plate 1 is fixedly connected at a position near the bottom of one side inside the empty box 1, a baffle plate 2 is fixedly connected at a position near the baffle plate 1 inside the empty box 1, and a square plate 2 is fixedly connected at one side of the baffle plate 2 inside the empty box 1, and a plurality of circular holes 1 are opened at equal intervals on the outer wall of the square plate 2. By providing the baffle plate 1, the baffle plate 2 or the square plate 2, the gathered high-temperature exhaust gas can be dispersed and blown out along a plurality of circular holes, so that the exhaust gas is evenly dispersed, effectively improving the working stability and the diffusivity of the gas.

[0016] 3. A hollow plate is fixedly connected near the center of the inside of the empty box 1, a plurality of circular holes 2 are opened at equal intervals on the outer wall of the hollow plate, a circular tube 3 is fixedly connected to the outer wall of one side of the hollow plate, and a circular tube 4 is fixedly connected to the outer wall of the other side of the hollow plate. By injecting water into the hollow plate, when the high-temperature exhaust gas contacts the inner wall of the circular hole 2, heat exchange is fully carried out, effectively improving the cooling efficiency of the exhaust gas. In addition, by opening a plurality of circular holes 2, the dispersed exhaust gas can be dispersed again, increasing the contact between more exhaust gas and the surface of the hollow plate and accelerating the heat absorption efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The present invention is further described below in conjunction with the accompanying drawings.

[0018] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0019] Figure 2 It is a schematic diagram of the partial cross-section structure of the exhaust gas cooling mechanism in the utility model;

[0020] Figure 3 It is a schematic diagram of the cross-sectional structure of the hollow plate of the utility model;

[0021] Figure 4 It is a partial cross-sectional structural diagram of a hollow box of the utility model;

[0022] Figure 5 It is a schematic diagram of the dust reduction mechanism and the filtering mechanism in the utility model.

[0023] In the figure: 100, exhaust gas collection mechanism; 110, square plate 1; 111, duct fan; 112, exhaust pipe; 113, air supply pipe; 200, exhaust gas cooling mechanism; 210, empty box 1; 211, baffle 1; 212, baffle 2; 213, square plate 2; 214, round hole 1; 215, round tube 1; 216, round tube 2; 220, hollow plate; 221, round hole 2; 222, round tube 3; 223, round tube 4; 230, round Shell one; 231, round hole three; 232, round hole four; 300, dust suppression mechanism; 310, empty box two; 311, round tube five; 312, round rod; 313, round shell two; 314, round tube six; 315, nozzle; 316, rotary joint; 317, spur gear one; 320, motor; 321, spur gear two; 330, air supply pipe; 400, filtering mechanism; 410, empty box three; 411, round tube seven; 420, activated carbon filter plate. DETAILED DESCRIPTION

[0024] The following will be combined with the practical embodiment to clearly and completely describe the technical solution in the practical embodiment. Obviously, the described embodiment is only a part of the practical embodiment, not all of the embodiments. Based on the embodiment in the practical, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this practical.

[0025] See also Figure 1-5In an embodiment of the utility model, an exhaust gas collection device for an injection molding machine includes an exhaust gas collection mechanism 100, the exhaust gas collection mechanism 100 includes a square plate 110, an exhaust gas cooling mechanism 200 is fixedly connected to the outer wall of the square plate 110 near the center, a dust reduction mechanism 300 is fixedly connected to the outer wall of the square plate 110 at one side of the exhaust gas cooling mechanism 200, a filtering mechanism 400 is fixedly connected to the top of the dust reduction mechanism 300, a duct fan 111 is fixedly connected to the outer wall of the square plate 110 near one end, an exhaust pipe 112 is fixedly connected to the air inlet of the duct fan 111, and an air supply pipe 113 is fixedly connected to the air outlet of the duct fan 111, and the exhaust gas cooling mechanism 200 includes an empty box 210, and the outer wall of the empty box 210 and the square plate are fixedly connected. The outer wall of the empty box 110 is fixedly connected, one end of the air supply pipe 113 is fixedly connected to the outer wall of the empty box 1 210, a baffle 1 211 is fixedly connected to the bottom of one side of the empty box 210, a baffle 212 is fixedly connected to the position of the baffle 1 211 inside the empty box 210, a square plate 213 is fixedly connected to one side of the baffle 212 inside the empty box 210, a plurality of circular holes 1 214 are evenly spaced on the outer wall of the square plate 213, a hollow plate 220 is fixedly connected to the center of the empty box 210, a plurality of circular holes 221 are evenly spaced on the outer wall of the hollow plate 220, a circular tube 3 222 is fixedly connected to the outer wall of one side of the hollow plate 220, and a circular tube 4 223 is fixedly connected to the outer wall of the other side of the hollow plate 220.

[0026] A circular shell 230 is rotatably connected to the inside of the empty box 210 near one side, a circular tube 215 is fixedly connected to the outer wall of one side of the empty box 210 at the circular shell 230, a circular tube 216 is fixedly connected to the outer wall of the other side of the empty box 210 at the circular shell 230, a plurality of circular holes 232 are opened at equal angles on the outer wall of the circular shell 230 around its axis, a plurality of circular holes 3 231 are opened at equal angles on the side wall of the circular shell 230 around its axis, the dust reduction mechanism 300 includes an empty box 2 310, the outer wall of the empty box 2 310 is fixedly connected to the outer wall of the square plate 110, a circular tube 5 311 is rotatably connected to the outer wall of the empty box 2 310, a circular rod 312 is fixedly connected to the outer wall of the circular tube 5 311 at one end, and the outer wall of the circular rod 312 at one end is located inside the empty box 210 and connected to the circular shell The outer wall of the first 230 is fixedly connected, the outer wall of one end of the circular tube 5 311 is sleeved and fixedly connected with a spur gear 1 317, the outer wall of the empty box 2 310 is located at the circular tube 5 311 and is fixedly connected with a motor 320, the outer wall of the rotating shaft of the motor 320 is sleeved and fixedly connected with a spur gear 2 321, the spur gear 2 321 is meshed with the spur gear 1 317 for transmission, the outer wall of one end of the circular tube 5 311 is rotatably connected with a rotary joint 316, the outer wall of the rotary joint 316 is fixedly connected with the outer wall of the empty box 2 310, a water outlet is opened on the outer wall of the circular tube 5 311, and the outer wall of the circular tube 5 311 is sleeved and fixedly connected with a circular shell 2 313 at the water outlet hole, the outer wall of the circular shell 2 313 is fixedly connected with four circular tubes 6 314 at equal angles around its axis, and a number of nozzles 315 are fixedly connected to the outer wall of the circular tube 6 314 at equal intervals.

[0027] An air supply pipe 330 is fixedly connected to the outer wall of the top of empty box two 310, and the filtering mechanism 400 includes an empty box three 410. The outer wall of empty box three 410 is fixedly connected to the outer wall of empty box two 310, one end of the air supply pipe 330 is fixedly connected to the bottom end of empty box three 410, an activated carbon filter plate 420 is fixedly connected to the inside of empty box three 410, and a circular tube seven 411 is fixedly connected to the outer wall of the top of empty box three 410.

[0028] Specifically, when working, the duct fan 111 is driven, and the exhaust gas enters the empty box 1 210 along the exhaust pipe 112 and the air supply pipe 113. When passing through the baffle 1 211 or the baffle 2 212, the exhaust gas is blown to the surface of the square plate 2 213, and evenly blown to the hollow plate 220 along the plurality of circular holes 1 214. Water is injected into the hollow plate 220 from the circular tube 3 222. When the dispersed high-temperature exhaust gas passes through the circular hole 221, it contacts the inner wall of the circular hole 221, which accelerates the heat absorption effect. The water after heat exchange flows out from the circular tube 4 223. By continuously injecting water into the hollow plate 220, the surface of the hollow plate 220 is always in a low temperature state to ensure the heat exchange effect. The exhaust gas discharged from the circular hole 221 floats to the circular shell 1 230. At , the motor 320 drives the circular tube six 314 to rotate and mesh with the spur gear one 317, drives the circular tube five 311 to rotate, drives the circular shell one 230 to rotate, and increases the contact area between the exhaust gas and the circular shell one 230, and injects water from the circular tube one 215 into the circular shell one 230, and the exhaust gas passes through the circular hole four 232 to fully absorb the heat in the exhaust gas, and the cooled exhaust gas enters the empty box two 310, and water is injected from the rotary joint 316, and enters the circular tube six 314 along the circular tube five 311, and is sprayed out from the nozzle 315 to reduce dust on the cooled exhaust gas. After dust reduction, the gas enters the empty box three 410 along the air supply pipe 330, and the gas filtered by the activated carbon filter plate 420 is discharged from the circular tube seven 411.

[0029] Embodiment 1

[0030] like Figure 2-3 As shown, in this embodiment, a hollow plate 220 is fixedly connected to the interior of the empty box 210 near the center position, a plurality of circular holes 221 are opened at equal intervals on the outer wall of the hollow plate 220, a circular tube 3 222 is fixedly connected to the outer wall of one side of the hollow plate 220, and a circular tube 4 223 is fixedly connected to the outer wall of the other side of the hollow plate 220.

[0031] In this embodiment, by injecting water into the hollow plate 220, when the high-temperature exhaust gas contacts the inner wall of the circular hole 221, sufficient heat exchange can be achieved. This process not only effectively improves the cooling efficiency of the exhaust gas, but also through the design of multiple circular holes 221, the exhaust gas can be dispersed again. Such a design increases the contact area between the exhaust gas and the inner wall of the hollow plate 220, thereby accelerating the heat absorption efficiency.

[0032] like Figure 4-5As shown, in this embodiment, a circular shell 230 is rotatably connected to the inside of the empty box 1 210 near one side, a circular tube 215 is fixedly connected to the outer wall of one side of the empty box 1 210 at the circular shell 1 230, and a circular tube 216 is fixedly connected to the outer wall of the other side of the empty box 1 210 at the circular shell 1 230. A plurality of circular holes 232 are opened at equal angles on the outer wall of the circular shell 1 230 around its axis, and a plurality of circular holes 3 231 are opened at equal angles on the side wall of the circular shell 1 230 around its axis. The dust reduction mechanism 300 includes an empty box 2 310, and the outer wall of the empty box 2 310 is connected to a square plate 1 The outer wall of the empty box 1 210 is fixedly connected, the outer wall of the empty box 2 310 passes through a circular tube 5 311 which is rotatably connected, the outer wall of the circular tube 5 311 at one end is fixedly connected to a round rod 312, the outer wall of the circular rod 312 at one end is located inside the empty box 1 210 and is fixedly connected to the outer wall of the circular shell 1 230, the outer wall of the circular tube 5 311 at one end is sleeved and fixedly connected to a spur gear 1 317, the outer wall of the empty box 2 310 is located at the circular tube 5 311 and is fixedly connected to a motor 320, the outer wall of the rotating shaft of the motor 320 is sleeved and fixedly connected to a spur gear 2 321, and the spur gear 2 321 is meshed with the spur gear 1 317 for transmission.

[0033] During specific implementation, the motor 320 drives the circular tube six 314 to rotate and engage with the spur gear one 317, drives the circular tube five 311 to rotate, drives the circular shell one 230 to rotate, increases the contact area between the exhaust gas and the circular shell one 230, injects water into the circular shell one 230 from the circular tube one 215, and the exhaust gas passes through the circular hole four 232, fully absorbing the heat in the exhaust gas.

[0034] Embodiment 2

[0035] like Figure 5 As shown, in this embodiment, the outer wall of one end of the circular tube five 311 is rotatably connected to a rotary joint 316, the outer wall of the rotary joint 316 is fixedly connected to the outer wall of the empty box two 310, a water outlet is opened on the outer wall of the circular tube five 311, and the circular shell two 313 is sleeved and fixedly connected to the water outlet of the outer wall of the circular tube five 311, four circular tubes six 314 are fixedly connected to the outer wall of the circular shell two 313 at equal angles around its axis, and a number of nozzles 315 are fixedly connected to the outer wall of the circular tube six 314 at equal intervals.

[0036] During the specific implementation, the motor 320 drives the circular tube six 314 to rotate and engage with the spur gear one 317, drives the circular tube five 311 to rotate, drives the circular shell two 313 to rotate, injects water from the rotary joint 316, enters the circular tube six 314 along the circular tube five 311, and is sprayed out from the nozzle 315 to reduce dust on the cooled exhaust gas.

[0037] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific characteristic structure materials or features described in conjunction with the embodiment or example are included in at least one embodiment or example of the present utility. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific characteristic structure materials or features described can be combined in any one or more embodiments or examples in a suitable manner.

[0038] The above contents are merely examples and explanations of the present invention. The technicians in this technical field may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the utility or exceed the scope defined in the claims, they should all fall within the protection scope of the present invention.

Claims

1. An exhaust gas collection device for an injection molding machine, characterized in that: The waste gas collection mechanism (100) comprises a square plate 1 (110), an exhaust gas cooling mechanism (200) is fixedly connected to the outer wall of the square plate 1 (110) near the center, a dust reduction mechanism (300) is fixedly connected to the outer wall of the square plate 1 (110) at one side of the exhaust gas cooling mechanism (200), and a filtering mechanism (400) is fixedly connected to the top of the dust reduction mechanism (300); A duct fan (111) is fixedly connected to an outer wall of the square plate one (110) near one end, an air inlet of the duct fan (111) is fixedly connected to an exhaust pipe (112), and an air outlet of the duct fan (111) is fixedly connected to an air supply pipe (113). The exhaust gas cooling mechanism (200) comprises an empty box one (210), an outer wall of the empty box one (210) is fixedly connected to an outer wall of the square plate one (110), and one end of the air supply pipe (113) is fixedly connected to the outer wall of the empty box one (210).

2. The waste gas collection device for an injection molding machine according to claim 1, characterized in that: A baffle plate 1 (211) is fixedly connected to a position near the bottom of one side of the empty box 1 (210), a baffle plate 2 (212) is fixedly connected to a position near the baffle plate 1 (211) inside the empty box 1 (210), a square plate 2 (213) is fixedly connected to a side of the baffle plate 2 (212) inside the empty box 1 (210), and a plurality of circular holes 1 (214) are opened on the outer wall of the square plate 2 (213) at equal intervals.

3. The waste gas collection device for an injection molding machine according to claim 2, characterized in that: A hollow plate (220) is fixedly connected to the center of the hollow box (210), a plurality of circular holes (221) are evenly spaced on the outer wall of the hollow plate (220), a circular tube (222) is fixedly connected to the outer wall of one side of the hollow plate (220), and a circular tube (223) is fixedly connected to the outer wall of the other side of the hollow plate (220).

4. The waste gas collection device for an injection molding machine according to claim 3, characterized in that: A circular shell (230) is rotatably connected to a position near one side of the interior of the empty box (210); a circular tube (215) is fixedly connected to the outer wall of one side of the empty box (210) at the circular shell (230); a circular tube (216) is fixedly connected to the outer wall of the other side of the empty box (210) at the circular shell (230); a plurality of circular holes (232) are opened at equal angles on the outer wall of the circular shell (230) around its axis; a plurality of circular holes (231) are opened at equal angles on the side wall of the circular shell (230) around its axis.

5. The waste gas collection device for an injection molding machine according to claim 4, characterized in that: The dust suppression mechanism (300) comprises an empty box 2 (310), the outer wall of the empty box 2 (310) is fixedly connected to the outer wall of the square plate 1 (110), a circular tube 5 (311) is rotatably connected to the outer wall of the empty box 2 (310), a circular rod (312) is fixedly connected to the outer wall of the circular tube 5 (311) at one end, the outer wall of the circular rod (312) at one end is located inside the empty box 1 (210) and is fixedly connected to the outer wall of the circular shell 1 (230), a spur gear 1 (317) is sleeved and fixedly connected to the outer wall of the circular tube 5 (311), the outer wall of the empty box 2 (310) is located at the circular tube 5 (311) and is fixedly connected to the motor (320), the outer wall of the rotating shaft of the motor (320) is sleeved and fixedly connected to the spur gear 2 (321), and the spur gear 2 (321) is meshed and driven with the spur gear 1 (317).

6. The waste gas collection device for an injection molding machine according to claim 5, characterized in that: The outer wall of one end of the circular tube five (311) is rotatably connected with a rotating joint (316), the outer wall of the rotating joint (316) is fixedly connected with the outer wall of the empty box two (310), the outer wall of the circular tube five (311) is provided with a water outlet hole, and the outer wall of the circular tube five (311) is sleeved and fixedly connected with the circular shell two (313), the outer wall of the circular shell two (313) is fixedly connected with four circular tubes six (314) at equal angles around its axis, and the outer wall of the circular tube six (314) is fixedly connected with a plurality of spray heads (315) at equal intervals.

7. The waste gas collection device for an injection molding machine according to claim 6, characterized in that: An air supply pipe (330) is fixedly connected to the outer wall at the top end of the empty box two (310), and the filtering mechanism (400) comprises an empty box three (410), the outer wall of the empty box three (410) is fixedly connected to the outer wall of the empty box two (310), one end of the air supply pipe (330) is fixedly connected to the bottom end of the empty box three (410), an activated carbon filter plate (420) is fixedly connected inside the empty box three (410), and a circular tube seven (411) is fixedly connected to the outer wall at the top end of the empty box three (410).

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